package main.java.indi.zyj.coderecord;

import main.java.indi.zyj.hot100.base.TreeNode;

public class MergeTrees {

    public TreeNode mergeTrees(TreeNode root1, TreeNode root2) {

        if (root1 == null && root2 == null) {
            return null;
        }
        if (root1 != null && root2 == null) {
            return root1;
        }
        if (root1 == null && root2 != null) {
            return root2;
        }

        TreeNode root = new TreeNode(root1.val + root2.val);

        root.left = mergeTrees(root1.left, root2.left);
        root.right = mergeTrees(root1.right, root2.right);

        return root;



    }

}
